Vardar, R. and Keskin, M. (2017) “Indications of 24-h esophageal pH monitoring, capsule pH monitoring, combined pH monitoring with multichannel impedance, esophageal manometry, radiology and scintigraphy in gastroesophageal reflux disease?”, Turkish Journal of Gastroenterology, 28(1), pp. S16-S21. doi: 10.5152/tjg.2017.06.